×

The effects of grain size and different multi-stage shearing techniques on shear strength along rock discontinuities. (English) Zbl 1466.74027

Summary: The effects of grain size and different multi-stage shearing techniques on shear strength along discontinuities were analyzed in this study. Laboratory direct shear tests were carried out on plaster mortar with maximum grain sizes of 0.5 mm and 1.0 mm. All specimen surfaces were essentially similar, copied from the same natural, Hungarian coarse-grained sandstone joint with a low joint roughness coefficient (JRC = 8). Tests within two different normal stress ranges \(( \sigma_n = 0.25\text{--}0.5\) and 0.5–1.5 MPa) were performed simultaneously. Specimens tested using the technique involving modified shearing with repositioning were sheared three times while being subjected to the same degree of normal stress (shearing sequence \(n = 1, 2, 3\)) and those with multi-stage technique without repositioning were subjected to shearing once at three different degrees of normal stress. The changing values of the peak friction angle calculated from the resulting peak shear strength-normal stress data pairs \((\tau_p - \sigma_n)\) were examined. Failure curves were estimated using linear regression, according to the Mohr-Coulomb failure criterion. The differences between the various peak friction angles obtained from experiments in which different multi-stage shearing techniques were used tend to increase in significance with the increasing number of shearing sequences. Peak friction angle values vary according to grain size of the material, though further investigations using more grain sizes are required to establish the extent of the effect on shear strength along discontinuities.

MSC:

74L10 Soil and rock mechanics
74R20 Anelastic fracture and damage
74-05 Experimental work for problems pertaining to mechanics of deformable solids
PDFBibTeX XMLCite
Full Text: DOI

References:

[1] Alias, R.; Kasa, A.; Taha, MR, Particle size effect on shear strength of granular materials in direct shear test, Int. J. Civ. Arch. Struct. Constr. Eng., 8, 11, 733-736 (2014)
[2] Barton, NR, A model study of rock-joint deformation, Eng. Geol., 7, 287-332 (1973) · doi:10.1016/0013-7952(73)90013-6
[3] Barton, N., The shear strength of rock and rock joints, Int. J. Rock Mech. Min. Sci. Geomech. Abstr., 13, 255-279 (1976) · doi:10.1016/0148-9062(76)90003-6
[4] Barton, N., Bandis, S.: Effects of block size on the shear behaviour of jointed rock. In: The 23rd U.S Symposium on Rock Mechanics, Berkeley, California, pp. 739-760 (1982)
[5] Barton, NR; Choubey, V., The shear strength of rock joints in theory and practice, Rock Mech., 10, 1-54 (1977) · doi:10.1007/BF01261801
[6] Buocz, I.; Rozgonyi-Boissinot, N.; Török, Á., Influence of discontinuity inclination on the shear strength of Mont Terri Opalinus claystones, Period. Polytech. Civ. Eng., 61, 447-453 (2017)
[7] Grasselli, G.; Egger, P., Constitutive law for the shear strength of rock joints based on three-dimensional surface parameters, Int. J. Rock Mech. Min. Sci., 40, 25-40 (2003) · doi:10.1016/S1365-1609(02)00101-6
[8] Haberfield, CM; Seidel, JP, Some recent advances in the modelling of soft rock joints in direct shear, Geotech. Geol. Eng., 17, 177-195 (1999) · doi:10.1023/A:1008900905076
[9] Islam, MN; Siddika, A.; Hossain, B.; Rahman, A.; Asad, A., Effect of particle size on the shear strength behaviour of sand, Aust. Geomech., 46, 3, 12 (2011)
[10] Köppel, M.; Martin, V.; Roberts, JE, A stabilized Lagrange multiplier finite-element method for flow in porous media with fractures, Int. J. Geomath., 10, 7 (2019) · Zbl 1425.35037 · doi:10.1007/s13137-019-0117-7
[11] Kumar, R.; Verma, AK, Anisotropic shear behaviour of rock joint replicas, Int. J. Rock Mech. Min. Sci., 90, 62-73 (2016) · doi:10.1016/j.ijrmms.2016.10.005
[12] Lee, Y-K; Park, J-W; Song, J-J, Model for the shear behaviour of rock joints under CNL and CNS conditions, Int. J. Rock Mech. Min. Sci., 70, 252-263 (2014) · doi:10.1016/j.ijrmms.2014.05.005
[13] Mentes, G., Relationship between river bank stability and hydrological processes using in situ measurement data, Cent. Eur. Geol., 62, 1, 83-99 (2019) · doi:10.1556/24.62.2019.01
[14] Miščević, P., Vlastelica, G.: Shear strength of weathered soft rock—proposal of test method additions. In: Vrkljan, I. (ed.) Proceedings of Regional Symposium of ISRM-EUROCK 2009, Rock Engineering in Difficult Conditions-Soft Rock and Karst, pp. 303-307 (2009)
[15] Muralha, J.; Grasselli, G.; Tatone, B.; Blümel, M.; Chryssanthakis, P.; Yujing, J.; Ulusay, R., ISRM suggested method for laboratory determination of the shear strength of rock joints: revised version, The ISRM Suggested Methods for Rock Characterization, Testing and Monitoring: 2007-2014 (2015), Berlin: Springer, Berlin
[16] Nakao, T.; Fityus, S., Direct shear testing of a marginal material using a large shear box, Geotech. Test. J., 31, 5, 393-403 (2008)
[17] Niktabar, SMM; Rao, KS; Shrivastava, AK, Effect of rock joint roughness on its cyclic shear behavior, J. Rock Mech. Geotech. Eng., 9, 1071-1084 (2017) · doi:10.1016/j.jrmge.2017.09.001
[18] Patton, F.D.: Multiple modes of shear failure in rock. In: 1st International Society for Rock Mechanics (ISRM) Congress (1966)
[19] Pirzada, MA; Roshan, H.; Sun, H.; Oh, J.; Andersen, MS; Hedayat, A.; Bahaaddini, M., Effect of contact surface area on frictional behaviour of dry and saturated rock joints, J. Struct. Geol., 135, 104044 (2020) · doi:10.1016/j.jsg.2020.104044
[20] Sanei, M.; Faramarzi, L.; Fahimifar, A.; Goli, S.; Mehinrad, A.; Rehmati, A., Shear strength of discontinuities in sedimentary rock masses based on direct shear tests, Int. J. Rock Mech. Min. Sci., 75, 119-131 (2015) · doi:10.1016/j.ijrmms.2014.11.009
[21] Wang, JJ; Zhang, H.; Tang, S.; Liang, Y., Effects of particle size distribution on shear strength of accumulation soil, J. Geotech. Geoenviron. Eng., 139, 11, 1994-1997 (2013) · doi:10.1061/(ASCE)GT.1943-5606.0000931
[22] Yang, J.; Rong, G.; Hou, D.; Peng, J.; Zhou, C., Experimental study on peak shear strength criterion for rock joints, Rock Mech. Rock Eng., 49, 821-835 (2016) · doi:10.1007/s00603-015-0791-1
[23] Zelasko, S., Krizek, R.J., Edil, T.B.: Shear behavior of sand as a function of grain characteristics. In: Proceedings of Conference on Soil Mechanics and Foundation Engineering, Istanbul, pp. 55-64 (1975)
[24] Zhao, J., Joint surface matching and shear strength part B: JRC-JMC shear strength criterion, Int. J. Rock Mech. Min. Sci., 34, 179-185 (1997) · doi:10.1016/S0148-9062(96)00063-0
This reference list is based on information provided by the publisher or from digital mathematics libraries. Its items are heuristically matched to zbMATH identifiers and may contain data conversion errors. In some cases that data have been complemented/enhanced by data from zbMATH Open. This attempts to reflect the references listed in the original paper as accurately as possible without claiming completeness or a perfect matching.